Box-strapping.



J E. MACMURRAY.

BOX STRAPPING. APPLICATION FILED MAY29, 1914.

Patented July 31, 1917.

r w w m I may, dam fim r era s ariw oration,

JAMES E. MAGMURRAY, OF CHICAGO, ILLINOIS, ASSIGNOR TO ACME ,STEEL GOODS COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BOX-STRAPPING.

To all, whom it may concern Be it known that 1, JAMES E. Mach/Inn- RAY, a'citizen of the United States, residing at Chicago, Illinois, have invented certain new and useful Improvements in Box-Strapping, of which the following is a specification.

My invention relates to box strapping formed of flexible sheet metal strips, and has for its object the production of an article of this character which shall have cross corrugations enabling a nail to be readily driven obliquely through it; which shall present a smooth bearing surface on its under side, thus enabling it to be drawn tightly around the box or other article to which it is applied; which shallrbe formed without cutting or slitting the metal with consequent impairment of ts strength and increased liability to tearing by the act of driving a nail through it; which shall be simple in construction and economical to manufactureyand in general shall exhibit and em-v body various features of novelty and utility notpossessed by previously known forms of box strapping. With the foregoing and incidental and related objects and advantages in view, my invention consists in the par-- ticular ormation, construction and arrangement 0 the portions of the strapping, the essential elements of which are pointed out in the appended claims.

In the drawing, Figure 1 is a fragmental section of a corner of a box showing my improved box strapping applied thereto; Fig. 2 is a top plan view of a portion of such strapping; Fig. 3 is a bottom view of the same; Fig. 4: is a central longitudinal section of a piece of strapping; and Figs. 5 and 6 are cross-sections, taken on the lines 5-5 and 6 -6, respectively,,of Fig. 2'.

The same letters of reference indicate the same parts in the several figures.

My improved box strapping is formed of astrip of flexible or malleable metal of uniform thickness, comprising a back or bearing portion 1, and upwardly and inwardly bent portions-2which are folded back over and upon the oppos'te upper sides of the portion 1, forming reinforced or strengthened edges of double thickness.

Specification of Letters Patent.

ratentea July 31, rear.

Application filed May 29, 1914. Serial No. 841,758.

The back portion 1 is provided with a central row of cross corrugations 3 which extend upwardly from the plane of the strip, thus leaving a smooth, plane bearing on each side of the corrugations on the under side of the strapping. It is obvious that this permits the strapping to be drawn tight around-an edge or corner of the box without rasping and much more easily and effectively applied than is possible with strapping having cross ridges or corrugations, or projections of any sort below its bearing surface. It is not absolutely essential, however, that the lower face of the strip shall all lie in one plane, .but only that the under side shall presenta smooth unobstructed surface with respect to longitudinal movement.

Sincethe metal is of practically its full thickness in the field of the corrugations, the driving of a nail through them has no tendency to cause a tear or split, either across or lengthwise of the strapping, as is the case with certain forms of box strapping heretofore'known in which cross channels or grooves have been :Eormed by cutting, or the metal is otherwise formed'of uneven thickness. If in any case an incipient tear by the folded over portions 2 will prevent it from extending clear across to the edge.

For convenience of measurement, the corrugations are interrupted by spaces 4 at equal distances apart, as for instance a foot,

thus enabling the length of a given piece of strapping to be quickly determined.

I claim: I

1. An integral sheet metal strip of flexible box strapping comprising a bearing portion having acontinuous smcoth bottom surface, and a central row of cross-corrugations of approximately the full thickness of the sheet extending upwardly from said bearing portion, said cross-corrugations pre senting a substantially continuous, sinuous line along a longitudinal section of the strip crossing such corrugations. 5

2. An integral sheet metal strip of flexible box strapping comprising a bearing portion having a continuous smooth bottom 

